I have a 1841 router and a 2950 switch. I am doing the router on a stick configuration. On the 1841 I have configured sub interfaces Fa0/0.120 & Fa0/0.130. On the switch I created VLAN 120 & 130. When I issued the command "no shutdown" on the 120 VLAN the 130 VLAN shuts down and vice versa. I am not sure what is going on.
Jon - Thanks for replying. I might be wrong put I should be able to have multiple VLAN configure on my 2950 switch at the same time. The port going up to my 1841 is a trunk port. The 1841 has sub interfaces and is doing the routing between the VLAN's. (router on a stick) I have deloyed this config with 2960 switches and didn't have a problem. Could this be a limitation with the 2950?
I think you are getting the L2 vlan and the L3 vlans mixed up . The 2950 can have up to like 250 L2 vlans on i believe so that shouldn't be an issue. You can only have 1 active L3 SVI on the 2950 to manage the switch with.
You only need a single ip address on the 2950 and that's to manage the switch only , so pick an address in one vlan or the other and use that . Your routing is done on the 1841 so why would you need more than 1 address on the 2950 ?
Jon & Glen are right (+5 each). The 2950 will allow multiple VLANs instances and interfaces configured, however, the 2950 will only support one active interface VLAN active at any given time. Remember that a Layer 2 switch only has an IP address for management purposes only thus the 2950 (like it's older predecessor, the 2900XL/3500XL) will only allow one active VLAN interface. This limitation will not affect your router-on-a-stick configuration. You'll just have to keep in mind to consistently use the sole-management IP address.
The 3550 is totally a different beast altogether. I'm not sure about the EA-series IOS but if you use the 12.2 version, you can enable multiple interface VLANs active. This holds true for any switches after the 3550: 2970, 2960, 3560, 3750 etc.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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